bug#22000: Patch addressing the menu-bar frame-resize interaction

[Vivek Dasmohapatra]

> Oh, I'm quite sure we want this on master, I'm just struggling with
> the idea of having all that non-trivial code on the release branch.
>
> Does anyone else have an opinion, or can offer one?

Only that I find the current size-jitter extremely annoying, which
is admittedly a very subjective thing. The actual merge window does
not matter so much to me because, well, I already have a patched
emacs on my system(s) by this point.